<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-alert title="添加商品信息" type="info"
                center show-icon :closable='false'></el-alert>
      <!--      步骤条-->
      <el-steps align-center :space="200" :active="activeIndex - 0" finish-status="success">
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!--      tab栏区域-->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position='top'>
        <el-tabs v-model='activeIndex' :tab-position="'left'" :before-leave='beforeTabLeave' @tab-click='tabClicked'>
          <el-tab-pane label="基本信息" name='0'>
            <el-form-item label='商品名称' prop='goods_name'>
              <el-input v-model='addForm.goods_name'></el-input>
            </el-form-item>
            <el-form-item label='商品价格' prop='goods_price'>
              <el-input v-model='addForm.goods_price' type='number'></el-input>
            </el-form-item>
            <el-form-item label='商品重量' prop='goods_weight'>
              <el-input v-model='addForm.goods_weight' type='number'></el-input>
            </el-form-item>
            <el-form-item label='商品数量' prop='goods_number'>
              <el-input v-model='addForm.goods_number' type='number'></el-input>
            </el-form-item>
            <el-form-item label='商品分类' prop='goods_cat'>
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name='1'>
            <!--            渲染表单的item项-->
            <el-form-item :label='item.attr_name' v-for='item in manyTableData' :key='item.attr_id'>
              <!--              复选框组-->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key='i' border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name='2'>
            <el-form-item :label='item.attr_name' v-for='item in onlyTableData' :key='item.attr_id'>
              <el-input v-model='item.attr_vals'></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name='3'>
            <!--              action 表示图片要上传的api地址-->
            <el-upload
              :action="uploadURL" :on-success='handleSuccess'
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers='headerObj'>
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name='4'>
            <!--            富文本编辑器-->
            <quill-editor v-model='addForm.goods_introduce'></quill-editor>
            <el-button type='primary' class='goodsAdd' @click='Add'>添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!--    图片预览的对话框-->
    <el-dialog
      title='图片预览'
      :visible.sync='previewVisible'
      width='50%'>
      <img :src='previewPath' alt='' class='previewImg'>
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    return {
      // 步骤条的激活状态
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        pics: [],
        // 商品详情
        goods_introduce: '',
        attrs: []
      },
      // 添加商品的表单验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类数据
      cateList: [],
      // 级联选择器对象
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数组
      manyTableData: [],
      // 静态属性列表数组
      onlyTableData: [],
      // 上传的地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传的请求头
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 图片预览的地址
      previewPath: '',
      // 图片预览对话框的显示
      previewVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品数据失败！')
      this.cateList = res.data
    },
    // 级联选择框改变事件
    handleChange () {
      // 如果attrs不为空，则清空
      if (this.addForm.attrs.length !== 0) {
        this.addForm.attrs = []
      }
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
        this.$message.error('请选择三级分类！')
      }
    },
    // 判断是否应该切换tabs标签
    beforeTabLeave (activeName, oldActivename) {
      if ((Math.abs(activeName - oldActivename) !== 1)) {
        this.$message.error('请按照顺序进行添加！')
        return false
      }
      if (oldActivename === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
      if (oldActivename === '0' && this.addForm.goods_name.length === 0) {
        this.$message.error('请输入商品名称！')
        return false
      }
    },
    // 标签点击事件
    async tabClicked () {
      // 证明访问的是动态参数面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) return this.$message.error('获取动态参数列表失败！')
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        // 访问静态属性面板
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) return this.$message.error('获取静态属性列表失败！')
        this.onlyTableData = res.data
      }
    },
    // 预览事件
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 照片remove事件
    handleRemove (file) {
      // 1．获取将要删除的图片的临时路径
      // 2．从pics数组中，找到这个图片对应的索引值
      // 3．调用数组的splice方法，把图片信息对象，从pics数组中移除
      const filePath = file.response.data.tmp_path
      const i = this.addForm.pics.findIndex(x =>
        x.pics === filePath
      )
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 上传图片成功之后的函数
    handleSuccess (response) {
      // 拼接得到一个图片信息对象
      // 将图片信息对象push到数组
      const picInfo = {
        pic: response.data.tmp_path
      }
      this.addForm.pics.push(picInfo)
    },
    // 添加商品操作
    Add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项目!')
        }
        // 执行添加逻辑！
        // lodash cloneDeep(obj)
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // 发起请求添加商品
        // 商品的名称唯一
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) return this.$message.error(res.meta.msg)
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang='less' scoped>
.el-checkbox{
  margin: 0 5px 0 0 !important;
}
.previewImg{
  width: 100%;
}
.goodsAdd{
  margin-top: 15px;
}
</style>
